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| Question | Answer |
| Why do organisms need energy? | Metabolism Movement Active Transport: Ions and molecules move against a concentration gradient which requires energy Maintenance, repair and division of cells Production of substances such as enzymes and hormones Maintenance of body temperature |
| How does ATP store its energy? | 1)ATP has 3 phosphate groups which makes the molecule unstable and so have a low A.E (therefore easy to break) 2)When they do break energy is released ATP+H2O→ADP+Pi As water is used, its a hydrolysis reaction |
| Describe how ATP is synthesised from ADP | This occurs in 3 ways: 1) Photophosphorylation: takes place in chlorophyll 2) Oxidative phosphorylation: Occurs in mitochondria during the process of electron transport 3) Substrate-Level phosphorylation: This is when phosphate groups are tranferred from donor molecules to ADP to make ATP |
| Why is ATP a better immediate source of energy than glucose? | -The hydrolysis of ATP to ADP is a single step reaction that releases immediate energy - Each ATP molecule releases less energy than each glucose molecule. Therefore, the energy for reaction is released in smaller, more manageable quantities. so it releases small amounts of energy |
| ATP is useful in many biological processes. Explain why. 4 Marks | |
| Describe how ATP is made in mitochondria. 6 Marks | |
| Humans synthesise more than their body mass of ATP each day. Explain why it is necessary for them to synthesise such a large amount of ATP 2 Marks |
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